/**
 ** \file CbmStsTrack.h
 ** \author V.Friese <v.friese@gsi.de>
 ** \since 28.08.06
 ** \date 07.09.15
 ** \brief Data class for STS tracks
 **
 ** Updated 25/06/2008 by R. Karabowicz.
 ** Updated 04/03/2014 by A. Lebedev <andrey.lebedev@gsi.de>
 ** Updated 10/06/2014 by V.Friese <v.friese@gsi.de>
 ** Updated 07/09/2015 by V.Friese <v.friese@gsi.de>
 **/


#ifndef CBMSTSTRACK_H
#define CBMSTSTRACK_H 1

#include <cassert>
#include "CbmTrack.h"
#include "FairLogger.h"



/** @class CbmStsTrack.h
 ** @brief Data class with information on a STS local track
 ** @author V.Friese <v.friese@gsi.de>
 ** @date 07.09.15
 ** @version 2.0
 **
 ** The STS track is a collection of STS and MVD hits, together
 ** with the track parameters obtained by the track fit.
 **/
class CbmStsTrack : public CbmTrack
{
public:

   /** Default constructor **/
   CbmStsTrack();


   /** Destructor **/
   virtual ~CbmStsTrack();


   /** Associate a MvdHit to the track
    ** @param hitIndex  Index of the MVD hit in TClonesArray
    **/
   void AddMvdHit(Int_t hitIndex) { fMvdHitIndex.push_back(hitIndex); }


   /** Associate a StsHit to the track
    ** @param hitIndex  Index of the STS hit in TClonesArray
    **/
   void AddStsHit(Int_t hitIndex) { AddHit( hitIndex, kSTSHIT); }


   /** Impact parameter
    ** @return  Impact parameter at target z in units of error [cm]
    **/
   Double_t GetB() const { return fB; }


    /** Index of a MVD hit
    ** @return Array index of the ith MVD hit of the track
    **
    ** Throws std::vector exception if out of bounds.
    **/
   Int_t GetMvdHitIndex(Int_t iHit) const { return fMvdHitIndex.at(iHit); }


   /** Total number of hits
    ** @return  Sum of numbers of STS and MVD hits
    **/
   virtual Int_t GetNofHits() const {
  	 return ( GetNofStsHits() + GetNofMvdHits() );
   }


   /** Number of MVD hits
    ** @return  Number of MVD hits associated to the track
    **/
   Int_t GetNofMvdHits() const { return fMvdHitIndex.size(); }


   /** Number of STS hits
    ** @return  Number of STS hits associated to the track
    **/
   Int_t GetNofStsHits() const { return CbmTrack::GetNofHits(); }


   /** Index of a STS hit
    ** @value Array index of the ith STS hit of the track
    **
    ** Throws std::vector exception if out of bounds.
    **/
   Int_t GetStsHitIndex(Int_t iHit) const {
  	 assert ( iHit < GetNofStsHits() );
  	 return GetHitIndex(iHit);
   }


  /** Set the impact parameter
    ** @param  Impact parameter at target z in units of error [cm]
    **/
   void SetB(Double_t b) { fB = b; }


   /** Debug output **/
   virtual std::string ToString() const;



private:

   /** Array with indices of the MVD hits attached to the track **/
   std::vector<Int_t> fMvdHitIndex;


   /** Impact parameter of track at target z, in units of its error **/
   Double32_t fB;


   ClassDef(CbmStsTrack, 2);
};

#endif